The problem is that the worm drives the gear on the axle. This puts the
drive shaft (worm) too low in the frame to be a motor shaft. The solution is
to rig a Delrin idler gear above the axle gear so the worm is near the
centerline of the boiler, then you can rig a high quality motor in the boiler to
power it. NWSL makes quite a few idler gears and worms to choose from and
I had them make several more custom gears for me for special installations.
The challenge is engineering the mounting for the bearings for the
idler gear shaft. I figure 10 to 20 hours of machine shop time would fix
one locomotive but have not figured a way of reducing the time to produce
each unit so have not tried to produce these kits.
It is so much easier to just buy a later model that has the drive in
the loco. The Westside C-16, T-12, later SP 4-6-0s, SP & NCNG 2-8-0, all
the D&RGW K's by Westside and PFM, Balboa C-19 and T-12, Key D&RGW C-17, 18,
19 and C&S 2-6-0 and 2-8-0s, PSC RGS 4-6-0's, Hallmark EBT 2-8-2, and
Lambert C&S 2-6-0 all have cab drive. Then you have a hollow tender for the
It is kind of like wanting to convert a 1959 Chevrolet into a
modern high tech Mercedes with GPS, CD player and all the modern features. It
is easiest to just buy the Mercedes or continue driving the Chevrolet, you
can add a good motor to the tender, just not a motor and sound.
In a message dated 4/22/2013 5:02:37 P.M. Central Daylight Time,
I was just given a basket case SP#9 (PFM/United, ca 1970). It has
everything but the tender motor.
Loco Doc says there's not enough space in tender to do much with his
tender drive. To add sound, I'll need to convert it to add a motor in the
Has anyone tried this? Suggestions on how to proceed?
[Non-text portions of this message have been removed]